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1. 发明专利

JPH02196989A VIBRATION CAPACITY TYPE ELECTROMETER FOR MEASURING RADIATON 失效
公开(公告)号：JPH02196989A
公开(公告)日：1990-08-03
申请号：JP1602189
申请日：1989-01-25
申请人： ALOKA CO LTD
发明人： KOYANO AKIRA , MATSUNAKA TOSHIYUKI , TAMURA NOBUYUKI , MAEKAWA HIROSHI
IPC分类号： G01T1/14 , G01T1/142 , G01T1/15 , H01J37/244
摘要： PURPOSE:To eliminate the need for an exciting coil for vibration electrode driving and to miniaturize the device by fixing a vibration electrode to a piezoelectric actuator. CONSTITUTION:The vibration electrode 30 is fixed to the bimorph piezoelectric actuator 36 in an insulated state. When a driving signal is applied, the actuator 36 vibrates to moves to and away from a fixed electrode 28. Here, when radiation is made incident, charges corresponding to the dose of the radiation are charged between the electrodes to develop a voltage between the electrodes 28 and 30. Then the electrode 30 vibrates as the actuator 36 vibrates to vary in electrostatic capacity according to the vibration, so the obtained voltage is an AC voltage and easily amplified. An AC voltage signal corresponding to the dose of the irradiating radiation is therefore obtained and the dose of the radiation can be displayed on a radiation display meter. Consequently, any exciting coil is not required and the device is reduced in size.

2. 发明专利

JPH02195292A SEMICONDUCTOR RADIATION DETECTOR 失效
公开(公告)号：JPH02195292A
公开(公告)日：1990-08-01
申请号：JP1486189
申请日：1989-01-24
申请人： ALOKA CO LTD
发明人： TAMURA NOBUYUKI
IPC分类号： G01T1/24 , H01L31/09
摘要： PURPOSE:To enable exact execution of energy calibration of a detector by executing the energy calibration by using a gamma-ray source in a detector provided with a semiconductor detecting element for charged particles which has a large area. CONSTITUTION:A detecting element for energy calibration is provided separately, and in this case, a semiconductor detecting element 24 for gamma rays and a bias power source circuit 26 for calibration which gives a bias voltage to the semiconductor detecting element 24 for gamma rays are provided. Besides, a switching circuit 28 composed of switches 28a and 28b is provided, and the switch 28a is turned ON to connect a semiconductor detecting element 10 of large area on the occasion of ordinary measurement of charged particles, while the switch 28b is turned ON to connect the semiconductor detecting element 24 for gamma rays on the occasion of execution of the energy calibration. In the case when the energy calibration is executed, the energy calibration of a detector using the semiconductor detecting element 10 of large area can be executed by means of a factor of proportionality.

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